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@Johntheo5 I removed the stat from the cylinder and left it around 60° and it wouldn't fire up. I'll try your suggestion when I'm back home later.

@ianmcd @CBW The HW only didn't trigger the boiler to turn on this morning so it does seem that there is a fault with that connection.

@CBW - I agree but last night it was experiencing the same issues and then turned on this morning just on HW. I'll report back in the morning with what happens. I'm probably more likely to short circuit the house/shock myself if I try and do something. I also don't have any test equipment but...

Thanks for the reply. Hopefully these images help. The image where CH mode is on only and thermostat turned up is the one where the Drayton valve is in the M position (also like that if HW is turned on as well as CH with thermostat up). If the thermostat isn't fully up but CH on then the boiler...

I have a Drayton LP722 central heating controller. Recently the hot water timer is not firing up the boiler (Baxi Solo 15 HE A) consistently. I noticed on the Monday evening (7.30pm - 8pm) that the boiler hadn't been triggered to turn on even though the light was green on the timing controller...